The invention discloses a
biogas synchronous edulcoration-CO2 electrocatalytic reduction integrated purification method, and belongs to the technical field of gas purification, a
biogas purification device is adopted to treat
biogas to be treated, the biogas to be treated is in full contact with an
electrolyte through a microbubble
aeration device, H2S and NH3 in the biogas to be treated are absorbed, and the rest of gas rises, so that the biogas to be treated is purified. The gas is in countercurrent contact with the
electrolyte sprayed by the spraying head, H2S and NH3 in the gas are further removed, the gas passes through the position where the three electrodes are located, CO2 in the gas is selectively reduced into CH4 through an electrocatalytic reduction reaction, and the purified biogas is discharged into a
methane collecting tank from an exhaust port I; the method is simple to operate and mild in reaction condition, purification of the biogas and purification of impurities are realized, and the purified biogas is convenient for subsequent collection and utilization.